{"id":3898,"date":"2023-06-15T11:29:40","date_gmt":"2023-06-15T03:29:40","guid":{"rendered":"https:\/\/lonelinerd.com\/?p=3898"},"modified":"2023-06-16T17:19:32","modified_gmt":"2023-06-16T09:19:32","slug":"thread-and-async-3","status":"publish","type":"post","link":"https:\/\/lonelinerd.com\/index.php\/2023\/06\/15\/thread-and-async-3\/","title":{"rendered":"C#\u7b46\u8a18 \u2013 \u7dda\u7a0b\u53ca\u7570\u6b65\uff08\u4e09\uff09\u7570\u6b65\u51fd\u6578"},"content":{"rendered":"\t\t
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\u7570\u6b65\u7de8\u7a0b<\/span><\/strong><\/h5>

  • \u57fa\u790e<\/span><\/p>

    • \u7570\u6b65\u57f7\u884c\u5145\u65a5\u4e86\u5f8c\u7e8c\u64cd\u4f5c\u3002\u5728\u958b\u59cb\u505a\u4e00\u4ef6\u4e8b\u60c5\u6642\uff0c\u8981\u544a\u77e5\u5176\u64cd\u4f5c\u5b8c\u6210\u5f8c\u61c9\u9032\u884c\u54ea\u4e9b\u64cd\u4f5c<\/span><\/p><\/li>

    • \u5728.NET\u4e2d\uff0c<\/span>\u5f8c\u7e8c\u64cd\u4f5c\u7531\u59d4\u6258\u52a0\u4ee5\u8868\u793a\uff0c\u901a\u5e38\u70ba\u63a5\u6536\u7570\u6b65\u64cd\u4f5c\u7d50\u679c\u7684action<\/span><\/span><\/span><\/p>

      • \u56e0\u6b64\u7570\u6b65\u65b9\u6cd5\u9700\u8981\u5305\u88dd\u591a\u500b\u4e8b\u4ef6\uff0c\u8868\u793a\u5728\u6210\u529f\u6216\u5931\u6557\u7684\u60c5\u6cc1\u4e0b\u61c9\u57f7\u884c\u54ea\u6bb5\u4ee3\u78bc<\/span><\/span><\/span><\/p><\/li><\/ul><\/li>

      • C#\u7de8\u8b6f\u5668\u6703\u5c0d\u6240\u6709await\u90fd\u69cb\u5efa\u4e00\u500b\u5f8c\u7e8c\u64cd\u4f5c<\/span><\/p><\/li><\/ul><\/li>

      • \u57fa\u65bc\u4efb\u52d9\u7684\u7570\u6b65\u6a21\u5f0f<\/span><\/p>

        • \u4e0d\u6703\u5c07\u5f8c\u7e8c\u64cd\u4f5c\u50b3\u905e\u7d66\u7570\u6b65\u64cd\u4f5c\uff0c\u800c\u662f\u5728\u7570\u6b65\u64cd\u4f5c\u958b\u59cb\u6642\u8fd4\u56de\u4e00\u500btoken<\/span><\/span><\/span><\/p><\/li>

        • \u9019\u500btoken\u7528\u65bc\u63d0\u4f9b\u5f8c\u7e8c\u64cd\u4f5c<\/span><\/p>

          • \u5b83\u8868\u793a\u6b63\u5728\u9032\u884c\u7684\u64cd\u4f5c\uff0c\u53ef\u80fd\u5df2\u7d93\u5b8c\u6210\uff0c\u4e5f\u53ef\u80fd\u6b63\u5728\u8655\u7406<\/span><\/span><\/span><\/p><\/li>

          • \u60f3\u6cd5\u662f\uff1a\u5728\u9019\u500b\u64cd\u4f5c\u5b8c\u6210\u4e4b\u524d\uff0c\u4e0d\u80fd\u9032\u884c\u4e0b\u4e00\u6b65\u8655\u7406<\/span><\/p><\/li>

          • token\u7684\u5f62\u5f0f\u901a\u5e38\u70baTask\u6216Task<\/span><\/span><\/span><TResult><\/span><\/p><\/li><\/ul><\/li>

          • C#5\u4e2d\u7684<\/span>\u7570\u6b65\u65b9\u6cd5\u57f7\u884c\u6d41<\/span><\/span><\/span><\/p>

            • \u57f7\u884c\u67d0\u4e9b\u64cd\u4f5c<\/span><\/p><\/li>

            • \u958b\u59cb\u7570\u6b65\u64cd\u4f5c\uff0c\u8a18\u4f4f\u8fd4\u56de\u7684token<\/span><\/span><\/span><\/p><\/li>

            • \u53ef\u80fd\u6703\u57f7\u884c\u5176\u4ed6\u64cd\u4f5c\uff08\u4e00\u822c\u4e0d\u6703\uff09<\/span><\/p><\/li>

            • \u7b49\u5f85\u7570\u6b65\u64cd\u4f5c\u5b8c\u6210\uff08\u901a\u904etoken\uff09<\/span><\/span><\/span><\/p><\/li>

            • \u57f7\u884c\u5176\u4ed6\u64cd\u4f5c<\/span><\/p><\/li>

            • \u5b8c\u6210<\/span><\/p><\/li><\/ul><\/li><\/ul><\/li>

            • \u7570\u6b65\u6a21\u578b<\/span><\/p><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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              \n\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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              C#\u7570\u6b65\u51fd\u6578<\/strong><\/h5>
              • \u7528async\u4fee\u98fe\u7b26\u8072\u660e\uff0c\u5305\u542bawait\u8868\u9054\u5f0f\u7684\u65b9\u6cd5\/\u533f\u540d\u51fd\u6578<\/span><\/span>
                • \u7de8\u8b6f\u5668\u5c07\u65b9\u6cd5\u4ee3\u78bc\u8f49\u63db\u6210\u5be6\u73fe\u4e86\u300c\u72c0\u614b\u6a5f\u300d<\/span><\/span>\u7684\u4e00\u500b\u985e\u578b<\/li>
                • await\u8868\u9054\u5f0f<\/li><\/ul><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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                  static async Task<string> TestReqAsync(string msg)<\/span>
                  {<\/span>
                   \u00a0 \u00a0using (var pipe = new MemoryStream())<\/span>
                   \u00a0  {<\/span>
                   \u00a0 \u00a0 \u00a0 \u00a0byte[] req = Encoding.UTF8.GetBytes(msg);<\/span>
                   \u00a0 \u00a0 \u00a0 \u00a0await pipe.WriteAsync(req, 0, req.Length); \/\/Call ContinueWith On Task, Return From TestReqAsync
                  <\/span>        
                          byte[] rsp = new byte[1000];<\/span>
                   \u00a0 \u00a0 \u00a0 \u00a0int bytesRead = await pipe.ReadAsync(rsp, 0, rsp.Length); \/\/Call ContinueWith On Task, Return From TestReqAsync<\/span>
                   \u00a0 \u00a0 \u00a0 \u00a0return Encoding.UTF8.GetString(rsp);<\/span>
                   \u00a0 }<\/span>
                  }<\/span><\/pre>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
                  \n\t\t\t\t\t\t
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                  \n\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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                      • \u9019\u4ee4\u8a72\u65b9\u6cd5\u50cf\u8fed\u4ee3\u5668\u4e00\u6a23\uff0c\u4e0d\u9700\u8981\u4e00\u76f4\u57f7\u884c\u5230\u7d50\u675f\u624d\u8fd4\u56de<\/span><\/span><\/p><\/li>
                      • \u7576\u7dda\u7a0b\u8abf\u7528TestReqAsync\u6642\uff0c\u6703\u69cb\u9020\u51fa\u4e00\u500bMemoryStream\uff0c\u4e26\u958b\u59cb\u57f7\u884cusing\u584a\u88e1\u9762\u7684\u4ee3\u78bc<\/p><\/li>
                      • \u57f7\u884c\u81f3WriteAsync\u6642\uff0cWriteAsync\u6703\u5728\u5167\u90e8\u5206\u914d\u4e00\u500bTask\u5c0d\u8c61<\/p>
                        • \u9019\u500bTask\u5c0d\u8c61\u6703\u8fd4\u56de\u7d66TestReqAsync<\/p><\/li>
                        • C#\u7684await\u64cd\u4f5c\u7b26<\/span><\/span>\u5be6\u969b\u4e0a\u6703\u5728Task\u5c0d\u8c61\u4e0a\u8abf\u7528ContinueWith\uff0c\u5411\u5b83\u50b3\u905e\u7528\u65bc\u6062\u5fa9\u72c0\u614b\u6a5f\u7684\u65b9\u6cd5<\/span><\/span><\/p><\/li>
                        • \u7136\u5f8c\u7dda\u7a0b\u5f9eTestReqAsync\u8fd4\u56de<\/span><\/span><\/p><\/li><\/ul><\/li>
                        • \u7576WriteAsync\u4efb\u52d9\u5728\u5c07\u4f86\u67d0\u500b\u6642\u5019\u5b8c\u6210\u6642\uff0c\u4e00\u500b\u7dda\u7a0b\u6c60\u7dda\u7a0b\u6703\u901a\u77e5Task\u5c0d\u8c61\uff0c\u6fc0\u6d3bContinueWith\u56de\u8abf\u65b9\u6cd5\uff0c\u6062\u5fa9\u72c0\u614b\u6a5f<\/span><\/span><\/p>
                          • \u7dda\u7a0b\u91cd\u65b0\u9032\u5165TestReqAsync\uff0c\u5f9eawait\u4f4d\u7f6e\u958b\u59cb\u7e7c\u7e8c\u57f7\u884c\u5f8c\u7e8c\u4ee3\u78bc<\/span><\/span><\/p><\/li><\/ul><\/li>
                          • \u57f7\u884c\u81f3ReadAsync\u6642\uff0c\u540c\u6a23\u6703\u5728\u5167\u90e8\u5206\u914d\u4e00\u500bTask<int><\/span>\u5c0d\u8c61\uff0c\u5176\u9918\u64cd\u4f5c\u8207WriteAsync\u985e\u4f3c<\/p><\/li>
                          • \u72c0\u614b\u6a5f\u57f7\u884c\u5b8c\u7562\u5f8c\uff0cGC\u9032\u884c\u56de\u6536<\/p><\/li><\/ul><\/li>
                          • \u5be6\u969b\u4e0a\uff0c\u4e00\u65e6\u628a\u65b9\u6cd5\u6a19\u8a18\u70baasync\uff0c\u7de8\u8b6f\u5668\u81ea\u52d5\u751f\u6210\u4ee3\u78bc\uff0c\u5728\u72c0\u614b\u6a5f\u958b\u59cb\u57f7\u884c\u6642\u5275\u5efa\u4e00\u500bTask\u5c0d\u8c61<\/span><\/span><\/p>
                            • IL_000e:  call \u00a0 \u00a0 \u00a0 valuetype [System.Threading.Tasks]System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<!0> valuetype [System.Threading.Tasks]System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<string>::Create()<\/span>
                              IL_0013:  stfld \u00a0 \u00a0  valuetype [System.Threading.Tasks]System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<string> CLR_Ch28.Program\/'<TestReqAsync>d__1'::'<>t__builder'<\/span><\/pre><\/li>
                            • \u9019\u500b\u5c0d\u8c61\u5728\u72c0\u614b\u6a5f\u57f7\u884c\u5b8c\u7562\u6642\u81ea\u52d5\u5b8c\u6210<\/span><\/span><\/p><\/li>
                            • TestReqAsync\u8fd4\u56de\u7684\u985e\u578b\u70baTask<string><\/span>\uff0c\u8a72Task<string><\/span>\u6b63\u662f\u7531\u7de8\u8b6f\u5668\u751f\u6210\u7684\u4ee3\u78bc\u70ba\u9019\u500b\u65b9\u6cd5\u7684\u8abf\u7528\u8005\u800c\u5275\u5efa\u7684\u5c0d\u8c61<\/p><\/li><\/ul><\/li><\/ul><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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                              Await\u8868\u9054\u5f0f<\/strong><\/h5>
                              • \u8ca0\u8cac\u6d88\u8cbb\u7570\u6b65\u64cd\u4f5c<\/span><\/span><\/li>
                              • \u5982\u679c\u8868\u9054\u5f0f\u7b49\u5f85\u7684\u503c\u9084\u4e0d\u53ef\u7528\uff0c\u7570\u6b65\u51fd\u6578\u7acb\u5373\u8fd4\u56de<\/span><\/span><\/li>
                              • \u7576\u503c\u53ef\u7528\u6642\uff0c\u7570\u6b65\u51fd\u6578\u5c07\u56de\u5230\u96e2\u958b\u7684\u5730\u65b9\u7e7c\u7e8c\u57f7\u884c\uff08\u5728\u9069\u7576\u7684\u7dda\u7a0b\u4e0a\uff09<\/span><\/span><\/li>
                              • await\u7684\u4efb\u52d9\u985e\u578b\u662fTask<\/span><\/span><\u985e\u578b\u53c3\u6578><\/span>\uff1b\u6574\u6bb5await\u8868\u9054\u5f0f\u985e\u578b\u5c31\u662f\u8a72\u985e\u578b\u53c3\u6578<\/span><\/p>
                                • await\u8868\u9054\u5f0f\u57f7\u884c\u7684\u662f\u300c\u62c6\u5305\u300d\uff08unwrap\uff09\u64cd\u4f5c<\/span><\/span><\/span><\/p><\/li>
                                • await\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5728\u7b49\u5f85\u8017\u6642\u64cd\u4f5c\u5b8c\u6210\u6642\u907f\u514d\u963b\u585e<\/span><\/span><\/p><\/li><\/ul><\/li>
                                • \u65b9\u6cd5\u5728\u57f7\u884c\u5230await\u8868\u9054\u5f0f\u6642\u5c31\u8fd4\u56de\u4e86<\/span><\/span>\uff0c\u5728\u6b64\u4e4b\u524d\u90fd\u662f\u540c\u6b65\u57f7\u884c\u7684<\/span><\/p>
                                  • \u5230\u9054await\u5f8c\uff0c\u4ee3\u78bc\u5c07\u6aa2\u67e5\u5176\u7d50\u679c\u662f\u5426\u5b58\u5728<\/span><\/span><\/p>
                                    • \u4e0d\u5b58\u5728\uff0c\u6703\u5b89\u6392\u4e00\u500b\u64cd\u4f5c\u5b8c\u6210\u5f8c\u7684\u5f8c\u7e8c\u64cd\u4f5c<\/span><\/span><\/p>
                                      • \u5f8c\u7e8c\u64cd\u4f5c\uff1a\u5728\u7570\u6b65\u64cd\u4f5c\u4e2d\u5b8c\u6210\u6642\u57f7\u884c\u7684\u56de\u8abf\u7a0b\u5e8f\u3002\u4fdd\u7559\u4e86\u65b9\u6cd5\u7684\u63a7\u5236\u72c0\u614b\u3002\u5f8c\u7e8c\u64cd\u4f5c\u8a18\u4f4f\u4e86\u5b83\u7684\u4f4d\u7f6e\uff0c\u5728\u57f7\u884c\u6642\u53ef\u56de\u5230\u539f\u8655\u3002<\/span><\/span><\/p><\/li>
                                      • Task\u985e\u5305\u542b\u4e00\u500b\u5c08\u9580\u7528\u65bc\u6dfb\u52a0\u5f8c\u7e8c\u64cd\u4f5c\u7684\u65b9\u6cd5\uff08Task.ContinueWith\uff09<\/span><\/p><\/li><\/ul><\/li><\/ul><\/li>
                                      • \u7570\u6b65\u51fd\u6578\u7684<\/span>\u8fd4\u56de\u985e\u578b<\/span><\/span>\u53ea\u80fd\u70ba\uff1a<\/span><\/p>
                                        • void<\/span><\/span><\/p><\/li>
                                        • Task<\/span><\/span><TResult><\/span><\/span><\/p><\/li>
                                        • Task<\/span><\/span><\/p><\/li><\/ul><\/li>
                                        • Task\u8868\u793a\u4e00\u500b\u53ef\u80fd\u9084\u672a\u5b8c\u6210\u7684\u64cd\u4f5c<\/span><\/p>
                                          • Task<\/span><TResult><\/span>\u8868\u793a\u4e00\u500b\u8fd4\u56de\u503c\u70baT\u985e\u578b\u7684\u64cd\u4f5c\uff0c\u800cTask\u4e0d\u9700\u8981\u7522\u751f\u8fd4\u56de\u503c<\/span><\/p><\/li>
                                          • \u5373\u4f7f\u6c92\u6709\u8fd4\u56de\u503c\uff0cTask\u672c\u8eab\u53ef\u4ee5\u4f7f\u8abf\u7528\u8005\u5728\u8fd4\u56de\u7684\u4efb\u52d9\u4e0a\uff0c\u9644\u52a0\u5f8c\u7e8c\u64cd\u4f5c<\/span><\/span><\/p><\/li>
                                          • void\u662f\u70ba\u4e86\u548c\u4e8b\u4ef6\u8655\u7406\u7a0b\u5e8f\u517c\u5bb9\uff0c\u53ea\u8abf\u7528\u7d66\u5b9a\u7684\u4e8b\u4ef6\u8655\u7406\u7a0b\u5e8f\uff0c\u6c92\u6709\u5fc5\u8981\u77e5\u9053\u4e8b\u4ef6\u751a\u9ebc\u6642\u5019\u771f\u6b63\u8655\u7406\u5b8c\u7562<\/span><\/span><\/p><\/li><\/ul><\/li>
                                          • \u5c0d\u65bc\u4e00\u500b\u7570\u6b65\u65b9\u6cd5\uff0c<\/span>\u53ea\u6709\u4f5c\u70ba\u4e8b\u4ef6\u8a02\u95b1\u8005\u6642\u624d\u61c9\u8a72\u8fd4\u56devoid\uff0c\u5728\u5176\u4ed6\u4e0d\u9700\u8981\u7279\u5b9a\u8fd4\u56de\u503c\u7684\u60c5\u6cc1\u4e0b\uff0c\u6700\u597d\u662f\u8fd4\u56deTask\u3002\u8abf\u7528\u8005\u5c31\u53ef\u4ee5\u300c\u7b49\u5f85\u64cd\u4f5c\u5b8c\u6210\u300d\u3002<\/span><\/span><\/p><\/li><\/ul><\/li>
                                          • \u53ef\u7b49\u5f85\u6a21\u5f0f<\/span><\/p>
                                            • \u4e00\u500bawait\u64cd\u4f5c\u5305\u542b\u4e86\u4e09\u7a2e\u64cd\u4f5c<\/span><\/span><\/span><\/p>
                                              • \u544a\u77e5\u662f\u5426\u5df2\u7d93\u5b8c\u6210<\/span><\/span><\/span><\/p><\/li>
                                              • \u5f8c\u7e8c\u64cd\u4f5c\u7684\u6dfb\u52a0<\/span><\/span><\/span><\/p><\/li>
                                              • \u7372\u53d6\u7d50\u679c\uff0c\u8fd4\u56de\u503c\u6216\u57f7\u884c\u6210\u529f\/\u5931\u6557\u7684\u4fe1\u606f<\/span><\/span><\/span><\/p><\/li><\/ul><\/li>
                                              • \u5c0d\u65bc\u4e00\u500bawait\u8868\u9054\u5f0f\uff0c<\/span>\u7de8\u8b6f\u5668\u751f\u6210\u7684\u4ee3\u78bc\u6703\u5148\u7528GetAwaiter()\uff0c\u7136\u5f8c\u4f7f\u7528awaiter\u7684\u6210\u54e1\u4f86\u7b49\u5f85\u7d50\u679c<\/span><\/span><\/span><\/p>
                                                • C#\u7de8\u8b6f\u5668\u8981\u6c42awaiter\u5fc5\u9808\u5be6\u73fe<\/span>INotifyCompletion\u63a5\u53e3<\/span><\/span><\/span><\/p>
                                                  • \/\/\u4f4d\u65bcSystem.Runtime.CompilerServices\u547d\u540d\u7a7a\u9593<\/span><\/span>
                                                    public<\/span> interface<\/span> INotifyCompletion<\/span><\/span>
                                                    {<\/span>
                                                     \u00a0 \u00a0void<\/span> OnCompleted<\/span>(Action<\/span> contiuation<\/span>);<\/span>
                                                    }<\/span><\/pre><\/li><\/ul><\/li>
                                                  • IsCompleted\u548cGetResult\u5fc5\u9808\u662fGetAwaiter()\u65b9\u6cd5\u8fd4\u56de\u985e\u578b\u4e0a\u7684\u771f\u6b63\u6210\u54e1\uff0c\u80fd\u7531\u5305\u542bawait\u8868\u9054\u5f0f\u7684\u4ee3\u78bc\u8a2a\u554f<\/span><\/span><\/span><\/p><\/li>
                                                  • \u5982\u679cGetResult()\u8fd4\u56devoid\uff0c\u6574\u500bawait\u8868\u9054\u5f0f\u5c31\u6c92\u6709\u985e\u578b<\/span><\/span><\/span><\/p>
                                                    • \u5426\u5247<\/span>await\u8868\u9054\u5f0f\u7684\u985e\u578b\u8207GetResult()\u7684\u8fd4\u56de\u985e\u578b\u76f8\u540c<\/span><\/span><\/span><\/p><\/li>
                                                    • using<\/span>(var<\/span> client<\/span> =<\/span> new<\/span> HttpClient<\/span>())<\/span>
                                                      {<\/span>
                                                       \u00a0 \u00a0Task<\/span><<\/span>string<\/span>><\/span> task<\/span> =<\/span> client<\/span>.GetStringAsync<\/span>(...);<\/span>
                                                       \u00a0 \u00a0string<\/span> result<\/span> =<\/span> await<\/span> task<\/span>;<\/span>
                                                      }<\/span><\/pre><\/li>
                                                    • \u5982\u679cawait\u8868\u9054\u5f0f\u4e0d\u8fd4\u56de\u4efb\u4f55\u985e\u578b\u7684\u503c\uff0c\u90a3\u5c31\u4e0d\u80fd\u5c07\u5176\u5206\u914d\u7d66\u8b8a\u91cf\u3001\u4f5c\u70ba\u65b9\u6cd5\u5be6\u53c3\u3001\u57f7\u884c\u4efb\u4f55\u5c07\u8868\u9054\u5f0f\u4f5c\u70ba\u503c\u7684\u76f8\u95dc\u64cd\u4f5c<\/span><\/p><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
                                                      \n\t\t\t\t\t\t
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                                                      \n\t\t\t\t
                                                      Await\u8868\u9054\u5f0f\u7684\u6d41<\/span><\/strong><\/h5>
                                                      • await\u5f8c\u9762\u6709\u6642\u662f\u65b9\u6cd5\u8abf\u7528\u7684\u7d50\u679c\uff0c\u6709\u6642\u662f\u5c6c\u6027<\/span><\/p>
                                                        • string<\/span> pageText<\/span> =<\/span> await<\/span> new<\/span> HttpClient<\/span>().GetStringAsync<\/span>(url<\/span>);<\/span><\/pre><\/li>
                                                        • await\u53ea\u662f\u5728\u64cd\u4f5c\u4e00\u500b\u503c\uff0c\u8a72\u4ee3\u78bc\u7b49\u50f9\u65bc<\/span><\/p><\/li>
                                                        • Task<\/span><<\/span>string<\/span>><\/span> task<\/span> =<\/span> new<\/span> HttpClient<\/span>().GetStringAsync<\/span>(url<\/span>);<\/span>
                                                          string<\/span> pageText<\/span> =<\/span> await<\/span> task<\/span>;<\/span><\/pre><\/li><\/ul><\/li>
                                                        • await\u8868\u9054\u5f0f\u7684\u7d50\u679c\uff08\u5982\u6709\uff09\u53ef\u4ee5\u7528\u4f5c\u5be6\u53c3\u6216\u4f5c\u70ba\u5176\u4ed6\u8868\u9054\u5f0f\u7684\u4e00\u90e8\u5206<\/span><\/span><\/span><\/p>
                                                          • AddPayment<\/span>(await<\/span> employee<\/span>.GetHourlyRateAsync<\/span>() *<\/span> await<\/span> timeSheet<\/span>.GetHoursWorkedAsync<\/span>(employee<\/span>.Id<\/span>));<\/span><\/pre><\/li><\/ul><\/li>
                                                          • \u57f7\u884c\u904e\u7a0b\u5230\u9054await\u8868\u9054\u5f0f\u5f8c\uff0c\u5b58\u5728\u5169\u7a2e\u53ef\u80fd<\/span><\/p>
                                                            • \u7b49\u5f85\u4e2d\u7684\u7570\u6b65\u64cd\u4f5c\u5df2\u7d93\u5b8c\u6210<\/span><\/p><\/li>
                                                            • \u7b49\u5f85\u4e2d\u7684\u7570\u6b65\u64cd\u4f5c\u5c1a\u672a\u5b8c\u6210<\/span><\/p><\/li><\/ul><\/li>
                                                            • \u7576\u7570\u6b65\u64cd\u4f5c\u4ecd\u5728\u57f7\u884c\u6642\uff0c\u65b9\u6cd5\u7570\u6b65\u5730\u7b49\u5f85\u64cd\u4f5c\u5b8c\u6210\uff0c\u7136\u5f8c\u57f7\u884c\u9069\u7576\u7684\u4e0a\u4e0b\u6587<\/span><\/p>
                                                              • \u300c\u7570\u6b65\u7b49\u5f85\u300d\u610f\u5473\u8457\u65b9\u6cd5\u4e0d\u518d\u57f7\u884c\uff0c\u628a\u5176\u5f8c\u7e8c\u7684\u64cd\u4f5c\u9644\u52a0\u4e86\u5728\u7570\u6b65\u64cd\u4f5c\u4e0a\uff0c\u7136\u5f8c\u8fd4\u56de<\/span><\/span><\/span><\/p><\/li>
                                                              • \u7136\u5f8c\u7b49\u5f85\u5b8c\u6210\u5f8c\uff0c\u518d\u88ab\u7570\u6b65\u64cd\u4f5c\u78ba\u4fdd\u65b9\u6cd5\u80fd\u5728\u6b63\u78ba\u7684\u7dda\u7a0b\u4e2d\u6062\u5fa9<\/span><\/span><\/span><\/p><\/li><\/ul><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
                                                                \n\t\t\t\t\t\t
                                                                \n\t\t\t\t\t\t\t
                                                                \n\t\t\t\t\t
                                                                \n\t\t\t
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                                                                \n\t\t\t\t\t\t
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                                                                \n\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
                                                                \n\t\t\t\t\t\t
                                                                \n\t\t\t\t\t\t\t
                                                                \n\t\t\t\t\t
                                                                \n\t\t\t
                                                                \n\t\t\t\t\t\t\t
                                                                \n\t\t\t\t\t\t
                                                                \n\t\t\t\t
                                                                \n\t\t\t\t\t\t\t\t
                                                                \n\t\t\t\t
                                                                  • \u5f9e\u4e00\u500b\u7570\u6b65\u65b9\u6cd5\u300c\u8fd4\u56de\u300d\u7684\u610f\u5473<\/span><\/p>
                                                                    • \u5982\u679c\u662f\u7b2c\u4e00\u500bawait\u8868\u9054\u5f0f\uff0c\u539f\u59cb\u8abf\u7528\u8005\u9084\u4f4d\u65bc\u68e7\u4e2d\u7684\u67d0\u500b\u4f4d\u7f6e\uff08\u5728\u5230\u9054await\u524d\uff0c\u65b9\u6cd5\u90fd\u662f\u540c\u6b65\u57f7\u884c\u7684\uff09<\/span><\/p>
                                                                      • \u5728\u9019\u7a2e\u60c5\u6cc1\uff0c\u6703\u5c07Task\u6216Task<\/span>\u8fd4\u56de\u7d66\u8abf\u7528\u8005<\/span><\/p><\/li><\/ul><\/li>
                                                                      • \u5df2\u7d93\u7b49\u5f85\u4e86\u5176\u4ed6\u64cd\u4f5c\uff0c\u56e0\u6b64\u8655\u65bc\u7531\u67d0\u500b\u64cd\u4f5c\u8abf\u7528\u7684\u300c\u5f8c\u7e8c\u64cd\u4f5c\u300d\u4e2d<\/span><\/p><\/li><\/ul><\/li><\/ul><\/li><\/ul>
                                                                        \u5f9e\u7570\u6b65\u65b9\u6cd5\u8fd4\u56de<\/span><\/strong><\/h5>
                                                                        • public<\/span> static<\/span> async<\/span> Task<\/span><<\/span>int<\/span>><\/span> GetPageLengthAsync<\/span>()<\/span>
                                                                          {<\/span>
                                                                           \u00a0 \u00a0using<\/span>(HttpClient<\/span> client<\/span> =<\/span> new<\/span> HttpClient<\/span>())<\/span>
                                                                           \u00a0  {<\/span>
                                                                           \u00a0 \u00a0 \u00a0 \u00a0Task<\/span><<\/span>string<\/span>><\/span> fetchTextTask<\/span> =<\/span> client<\/span>.GetStringAsync<\/span>(url<\/span>);<\/span>
                                                                           \u00a0 \u00a0 \u00a0 \u00a0int<\/span> length<\/span> =<\/span> (await<\/span> fetchTextTask<\/span>).Length<\/span>;<\/span>
                                                                           \u00a0 \u00a0 \u00a0 \u00a0return<\/span> length<\/span>;<\/span>
                                                                           \u00a0  }<\/span>
                                                                          }<\/span><\/pre><\/li>
                                                                        • \u65b9\u6cd5\u4e2d\uff0creturn\u7684\u985e\u578b\u662fint\uff0c\u800c\u65b9\u6cd5\u7c3d\u540d\u4e2d\u7684\u8fd4\u56de\u985e\u578b\u70baTask<\/span><\/p><\/li>
                                                                        • \u4ee3\u8868\u751f\u6210\u7684\u4ee3\u78bc\u70ba\u6b64\u9032\u884c\u4e86\u5305\u88dd\uff0c\u8abf\u7528\u8005\u5c07\u5f97\u5230\u4e00\u500bTask<\/span><\/span><\/span>\uff0c<\/span>\u4e26\u6700\u7d42\u5728\u65b9\u6cd5\u5b8c\u6210\u6642\u5f97\u5230\u5176\u8fd4\u56de\u503c\uff08int length\uff09<\/span><\/span><\/span><\/p><\/li>
                                                                        • \u5305\u88dd\u7684\u5fc5\u8981\u6027<\/span><\/p>
                                                                          • \u5728\u5230\u9054return\u8a9e\u53e5\u524d\uff0c\u5e7e\u4e4e\u5fc5\u7136\u6703\u767c\u751f\u300c\u8fd4\u56de\u5230\u8abf\u7528\u8005\u300d\u7684\u884c\u70ba\uff08await\uff09\uff0c\u6211\u5011\u9700\u8981\u67d0\u7a2e\u65b9\u5f0f\u5411\u8abf\u7528\u8005\u50b3\u64ad\u4fe1\u606f\uff0c\u800cTask<\/span><\/span><\/span>\u5c31\u662f\u901a\u77e5\u8abf\u7528\u8005\uff0c\u5c0d\u8a72\u65b9\u6cd5\u672a\u4f86\u751f\u6210\u7684\u503c\u6216\u62cb\u51fa\u7684\u7570\u5e38\u6240\u505a\u51fa\u7684\u627f\u8afe<\/span><\/span><\/span><\/p><\/li><\/ul><\/li>
                                                                          • \u5982\u679creturn\u8a9e\u53e5\u51fa\u73fe\u5728\u6709finally\u7684try\u584a\u4e2d\uff0c\u90a3\u7528\u4f86\u8a08\u7b97\u8fd4\u56de\u503c\u7684\u8868\u9054\u5f0f\u5c07\u7acb\u5373\u88ab\u6c42\u503c\uff0c\u4f46\u76f4\u5230\u6240\u6709\u5c0d\u8c61\u6e05\u7406\u5b8c\u7562\u5f8c\uff0c\u624d\u6703\u4f5c\u70ba\u4efb\u52d9\u7d50\u679c<\/span><\/span><\/span><\/p>
                                                                            • \u540c\u7406\uff0c\u5982\u679cfinally\u62cb\u51fa\u4e00\u500b\u7570\u5e38\uff0c\u6574\u500b\u4ee3\u78bc\u90fd\u6703\u5931\u6557<\/span><\/p><\/li><\/ul><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
                                                                              \n\t\t\t\t\t\t
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                                                                              \n\t\t\t\t\t
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                                                                              \n\t\t\t\t
                                                                              \u7570\u5e38<\/span><\/strong><\/h5>
                                                                              • Task\u8868\u793a\u7570\u5e38\u7684\u65b9\u5f0f<\/span><\/p>
                                                                                • \u7570\u6b65\u64cd\u4f5c\u5931\u6557\uff0c\u4efb\u52d9\u7684Status\u8b8a\u70baFaulted<\/span><\/span><\/span><\/p><\/li>
                                                                                • Exception\u5c6c\u6027\u8fd4\u56de\u4e00\u500bAggregateException\uff0c\u5305\u542b\u6240\u6709\u9020\u6210\u4efb\u52d9\u5931\u6557\u7684\u7570\u5e38\uff1b\u6c92\u6709\u932f\u8aa4\u5247\u8fd4\u56denull<\/span><\/span><\/span><\/p><\/li>
                                                                                • \u5982\u679c\u4efb\u52d9\u6700\u7d42\u72c0\u614b\u70ba\u932f\u8aa4\uff0cWait()\u65b9\u6cd5\u62cb\u51fa\u4e00\u500bAggregateException<\/span><\/span><\/span><\/p><\/li>
                                                                                • Task<\/span>\u7684<\/span>Result\u5c6c\u6027\u62cb\u51faAggregateException<\/span><\/span><\/span><\/p><\/li>
                                                                                • \u901a\u904eCancellationTokenSource\u548cCancellationToken\u4f86\u5be6\u73fe\u53d6\u6d88\u64cd\u4f5c<\/span><\/span><\/span><\/p>
                                                                                  • \u5982\u679c\u4efb\u52d9\u53d6\u6d88\u4e86\uff0cWait()\u65b9\u6cd5\u548cResult\u5c6c\u6027\u62cb\u51fa\u5305\u542bOperationCanceledException\u7684AggregateException<\/span><\/span><\/span><\/p><\/li><\/ul><\/li>
                                                                                  • \u5728\u7b49\u5f85\u4efb\u52d9\u6642\uff0c\u4efb\u52d9\u51fa\u932f\/\u53d6\u6d88\u90fd\u62cb\u51faAggregateException\u4e2d\u7684\u7b2c\u4e00\u500b\u7570\u5e38<\/span><\/span><\/span><\/p><\/li><\/ul><\/li><\/ul>
                                                                                    • \u5728\u7b49\u5f85\u6642\u62c6\u5305\u7570\u5e38<\/span><\/p>
                                                                                      • awaiter\u7684GetResult\u53ef\u4ee5\u7372\u53d6\u5de5\u4f5c\u4e2d\u7684\u7570\u5e38\uff0c\u5c07\u7570\u5e38\u5f9e\u7570\u6b65\u64cd\u4f5c\u50b3\u905e\u56de\u65b9\u6cd5\u4e2d<\/span><\/span><\/span><\/p>
                                                                                        • \u4f46\u662f<\/span>\u55ae\u500bTask\u53ef\u4ee5\u8868\u793a\u591a\u500b\u64cd\u4f5c\uff0c\u4e26\u5c0e\u81f4\u591a\u500b\u5931\u6557<\/span><\/span><\/span><\/p><\/li><\/ul><\/li>
                                                                                        • async<\/span> Task<\/span><<\/span>string<\/span>><\/span> FetchFirstSuccessfulAsync<\/span>(IEnumerable<\/span><<\/span>string<\/span>><\/span> urls<\/span>)<\/span>
                                                                                          {<\/span>
                                                                                           \u00a0 \u00a0foreach<\/span>(string<\/span> url<\/span> in<\/span> urls<\/span>)<\/span>
                                                                                           \u00a0  {<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0try<\/span><\/span>
                                                                                           \u00a0 \u00a0 \u00a0  {<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0using<\/span>(var<\/span> client<\/span> =<\/span> new<\/span> HttpClient<\/span>())<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  {<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0return<\/span> await<\/span> client<\/span>.GetStringAsync<\/span>(url<\/span>);<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  }<\/span>
                                                                                           \u00a0 \u00a0 \u00a0  }<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0catch<\/span>(WebException<\/span> e<\/span>) { ... };<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0<\/span>
                                                                                           \u00a0 \u00a0 \u00a0 \u00a0throw<\/span> new<\/span> WebException<\/span>(\"...\"<\/span>);<\/span>
                                                                                           \u00a0  }<\/span>
                                                                                          }<\/span><\/pre><\/li>
                                                                                        • \u6355\u7372WebException<\/span><\/p>
                                                                                          • GetStringAsync\u53ea\u662f\u8ca0\u8cac\u555f\u52d5\u64cd\u4f5c\uff0c\u8fd4\u56de\u4e00\u500b\u5305\u542bWebException\u7684\u4efb\u52d9\uff08Task\uff09<\/span><\/p><\/li>
                                                                                          • \u5982\u679c\u8abf\u7528\u4efb\u52d9\u7684Wait\uff0c\u5247\u62cb\u51fa\u4e00\u500b\u5305\u542bWebException\u7684AggregateException<\/span><\/p><\/li>
                                                                                          • \u4efb\u52d9awaiter\u7684GetResult\u65b9\u6cd5\u62cb\u51faWebException\uff0c\u4e26\u88ab\u4ee5\u4e0a\u4ee3\u78bc\u6355\u7372<\/span><\/span><\/span><\/p>
                                                                                            • \u4f46\u9019\u6703\u5c0e\u81f4\u4fe1\u606f\u4e1f\u5931<\/span><\/p><\/li>
                                                                                            • \u5982\u679c\u932f\u8aa4\u7684\u4efb\u52d9\u4e2d\u5305\u542b\u591a\u500b\u7570\u5e38\uff0cGetResult\u53ea\u80fd\u62cb\u51fa\u7b2c\u4e00\u500b\u7570\u5e38<\/span><\/span><\/span><\/p><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li>
                                                                                            • \u5728\u62cb\u51fa\u7570\u5e38\u6642\u9032\u884c\u5305\u88dd<\/span><\/p>
                                                                                              • \u7570\u6b65\u65b9\u6cd5\u5728\u8abf\u7528\u6642\u6c38\u9060\u4e0d\u6703\u76f4\u63a5\u62cb\u51fa\u7570\u5e38\u3002<\/span><\/p>
                                                                                                • \u65b9\u6cd5\u8fd4\u56de\u4e00\u500bTask\/Task<\/span>\uff0c\u5176\u4e2d\u62cb\u51fa\u7684\u4efb\u4f55\u7570\u5e38\u90fd\u5c07\u7c21\u55ae\u5730\u50b3\u905e\u7d66\u4efb\u52d9<\/span><\/p><\/li>
                                                                                                • \u5982\u679c\u8abf\u7528\u8005\u76f4\u63a5\u7b49\u5f85\uff08Wait()\uff09\u4efb\u52d9\uff0c\u5247\u5f97\u5230\u4e00\u500b\u5305\u542b\u771f\u6b63\u7570\u5e38\u7684AggregateException<\/span><\/p><\/li>
                                                                                                • \u5982\u679c\u4f7f\u7528await\uff0c\u7570\u5e38\u5247\u6703\u5f9e\u4efb\u52d9\u4e2d\u89e3\u5305<\/span><\/p><\/li><\/ul>
                                                                                                  • \u4e00\u822c\u53ea\u9700\u6355\u7372\u5d4c\u5957\u7684\u7570\u6b65\u65b9\u6cd5\u6240\u62cb\u51fa\u7684\u7570\u5e38\u5373\u53ef<\/span><\/p><\/li><\/ul><\/li>
                                                                                                  • \u5931\u6548\u7684\u53c3\u6578\u9a57\u8b49<\/span><\/p>